Located on the Champ de Mars in Paris, the Eiffel Tower has become a global icon of France and one of the most recognizable structures in the world. Named after its designer, engineer Gustave Eiffel, the tower was built as the entrance arch to the 1889 World’s Fair and stands at 1,063 feet tall. It was the tallest man-made structure in the world until the Chrysler Building was built in 1930.
The Tower of the Americas is a 750-foot observation tower/restaurant on the southeastern edge of Downtown San Antonio, Texas, USA. The tower was built as the theme structure of the 1968 World's Fair. It was the tallest observation tower in the United States until 1996 when the Las Vegas Stratosphere Tower was completed.
This iconic structure located in Auckland City, New Zealand is an observation and telecommunications tower and is also part of the SKYCITY Auckland casino complex. Standing at a height of 328 meters (1,076 feet) it is the tallest free-standing structure in the Southern Hemisphere and attracts over 500,000 visitors per year.
Leaning Tower of Pisa is the campanile, or freestanding bell tower, of the cathedral of the Italian city of Pisa, known worldwide for its unintended tilt to one side. It is situated behind the Cathedral and is the third oldest structure in Pisa's Cathedral Square (Piazza del Duomo) after the Cathedral and the Baptistry. The tower's tilt began during construction, caused by an inadequate foundation on ground too soft on one side to properly support the structure's weight.